Heterocyclic disazo dyestuffs containing a bridging group and at least one quaternary ammonium group

ABSTRACT

Disazo compounds in which two monoazo dyestuff molecules of the general formula   IN WHICH D represents the residue of heterocyclic diazo component, A represents an arylene residue and R&#39;&#39; and R&#39;&#39;&#39;&#39; each represents an alkyl residue, are linked together via their coupling components through a bifunctional bridging group Z which has no dyestuff characteristics and which contains at least one quaternated nitrogen atom. The compounds are used for dyeing synthetic fibers such as polyvinyl chloride and demonstrate good light and washing fastness.

United States Patent 1 1 Hegar et al.

1451 Aug. 28, 1973 I'IETEROCYCLIC DISAZO DYESTUFFS CONTAINING A BRIDGING GROUP AND AT LEAST ONE QUATERNARY AMMONIUM GROUP [75] Inventors: Gert Hegar, Schoenenbuch;

Hans-Joerg Angliker, Riehen; Richard Peter, Basel, all of Switzerland [73] Assignee: Ciba-Geigy AG, Basel, Switzerland [22] Filed: May 19, 1971 [21] Appl. No.: 145,005

Related US. Application Data [63] Continuation-in-part of Ser. No. 730,943, May 21,

1968, Pat. No. 3,635,940.

[] Foreign Application Priority Data May 29, 1967 Switzerland 7532/67 52 us. c1 2 0 1 5 s, 2 0/15g, 2

260/157, 260/158, 260/160, 260/163 [51] 161. C1. C09b 33/06, D06p 1/02 58 FieldoiSearch ..260/l55, 260/156,

[5 6] References Cited UNITED STATES PATENTS 1/1972 Hegar et a1. 260/ 11/1941 Knight 260/ 2,286,391 6/1942 Sparks 260/154 2,734,053 2/1956 Grandjean et a1. 260/147 2,813,856 1 1/1957 Steinemann et a1. 260/174 2,879,265 3/1959 Steinemann 260/147 2,945,849 7/1960 Kruckenberg et a1. 260/ 3,271,383 9/1966 Yamaya et a1 260/158 3,291,788 12/1966 Yamaya et a1 260/157 Primary Examiner-Floyd D. Higel Attorney-Harry Goldsmith, Joseph G. Kolodny and Mario A. Monaco [5 7 ABSTRACT Disazo compounds in which two monoazo dyestuff molecules of the general formula 7 Claims, No Drawings IIETEROCYCLIC DISAZO DYESTUFFS CONTAINING A BRIDGING GROUP AND AT LEAST ONE QUATERNARY AMMONIUM GROUP CROSS-REFERENCE TO A RELATED APPLICATION This application is a continuation in part of application Ser. No. 730,943, filed May 21, 1968; and now US. Pat. No. 3,635,940.

The present invention provides new and valuable disazo compounds in which two monoazo dyestuff molecules of the general formula in which D represents the residue of a monocyclic or bicyclic diazo component, A represents an arylene residue and R and R" each represents an alkyl residue, are linked together via their coupling components through a bifunctional bridging group Z which has no dyestuff characteristics and which contains at least one quatemated nitrogen atom. Generally, the symbol A stands for a 1,4-phenylene residue.

Accordingly, the invention provides, for example, disazo compounds of the formula in which x,, x x and x, each represents zero or 1 and x 'l'xz .1; +15, R1, R2, RI, R g, R and R, 686]! represents a hydrogen atom or preferably an alkyl group that may be substituted and in which when x, 1 and/or x l, R, may be bound to the residue A, to form a ring and/or R, may be bound to the residue A, to form a ring; R,, and R each represents an alkylene group that may be substituted; A and A each represents a phenylene residue that may be substituted and in which the azo group and the secondary or tertiary amino group are in 1,4-position to each other; D, and D, each represents the residue of a monocyclic or bicyclic diazo component and Z represents a bifunctional bridging group which has no dyestuff characteristics and which contains at least one quaternated nitrogen atom. v

The invention may be further defined as follows: a disazo compound as shown in the formula on page 2, line 14, in which X,, X X and X, each represents zero I and X1 X X, X4 R1, R2, RI, RI, R s and R, each represents alkyl containing up to carbon atoms or alkyl containing up to 10 carbon atoms substituted by a member selected from the group consisting of chlorine, bromine, phenyl, phenoxy, C,-C,,,-

fatty acid acyloxy, C,-C,,,-fatty acid acylamino, cyano,

2 C,-C,-alkoxy, benzoyl, cyanethoxy, C -C alkylcarbamoyl, aminocarbonyl and C -C alkylocycarbonyloxy, and when said R, is bound to A, forms a tetrahydro-quinoline ring and when said R, is bound to A, forms a tetrahydro-quinoline ring; R,, and R 4 each is alkylene of up to three carbon atoms or a group of the formula wherein Ac represents alkanoyl of up to five carbon atoms, benzoyl, stearoyl, phenoxycarbonyl, carbonyl, alkoxy containing up to five carbon atoms, phenylaminocarbonyl or methylaminocarbonyl; A, and A each is a phenylene group of the formula wherein c, and d, each represents hydrogen, C, -alkyl, C, -alkoxy, fatty acid acylamino containing up to five carbon atoms, phenoxycarbonylamino, or C,-C,- alkoxy-carbonylamino or aminocarbonylamino; the azo group and the dialkylamino group in said formula are attached in para-position to each other; D, and D each represents the residue of a diazo component of the heterocyclic series and Z is selected from the group consisting of l. a residue of the formula wherein Z is a heterocyclic containing up to six carbon atoms and containing nitrogen, 2. a group selected from the formula and in which Y represents an anion and R,, and R together each are C,-C -alkyl or form an alkylene chain that may be interrupted by a hetero atom selected from the group consisting of nitrogen, oxygen and sulfur and contains up to five carbon atoms; and more particularly compounds of said fomiula wherein X,, X,, X, and X, each represents zero or i and X, X, X X, 2; R,, R,, R',, R,, R, and R, each represents alkyl of up to four carbon atoms, or alkyl containing up to four carbon atoms, substituted by a member selected from the group consisting of chlorine, bromine, phenyl, phenoxy, C,-C,,,-fatty acid acyloxy, C,-C,,,-fatty acid acylamino, cyano, C,-C,-alkoxy, benzoyl, cyanethoxy, and when said R, is bound to A, forms a tetrahydroquinoline ring and when said R, is bound to A, forms a tetrahydro-quinoline ring; R, and R, each is alkylene of up to three carbon atoms or alkylene substituted with alkylcarbonyl oxy containing up to three carbon atoms; A and A; each is phenylene or phenylene substituted with methyl, methoxy, chlorine or acetylamino; the azo group and the dialkylamino group in said formula are attached in para-position to each other; D, and D each represents the residue of a diazo component of the heterocycl cyclic series and Z is selected from the group consisting of l. a residue of the formula wherein Z is a heterocyclic containing up to six carbon atoms, and containing nitrogen,

2. a group selected from the formulae in which Y" represents an anion and R and R together form an alkylene chain that may be interrupted by a hetero atom selected from the group consisting of nitrogen, oxygen and sulfur, and contains up to five carbon atoms.

3. when R, and R form a part of a tetrahydroquinoline structure, or when X;, or X is l, or when R, and R are B-acetoxy-propylene, Z is a group of the formula wherein R and R',, are C -C -alkyl, or a group of the formula Y'- Y- N+CiCialkyleneN+ R's R, R R,

The bridging group Z may contain cycloammonium or alkylammonium groups, for example, a group of the formula in which Y represents an anion and R and R each represents an alkyl, aralkyl or'cycloalkyl group, and in which R; and R together may form an alkylene chain that may be interrupted by a hetero atom or part of an aromatic ring.

The dyestuffs of the invention are generally free from carboxylic and sulphonic acid groups. The diazo residues D, nd D may be identical or different and are principally derivatives of monocyclic or bicyclic amines or any diazotizable heterocyclic amine which is free from acidic substituents imparting solubility in water, but especially amines containing a five-membered heterocyclic ring having two or three hetero atoms, especially one nitrogen atom and one or two sulphur, oxygen or nitrogen atoms, and aminobenzenes, especially those of the formula phonylbenzthiazole,

wherein A is a residue of a diazo component of the thiazole, benzothiazole, pyrazole, thiophene, thiadiazole, imidazole, thiazole, benzoimidazole, pyridine, benzoisothiazole, isothiazole or indazole series.

More particularly, the diazo components may be thiazolyl optionally substituted by chlorine, bromine, cyano, nitro, phenyl, C,-C -alky] (such as methyl or ethyl), C,-C,-alkoxy (such as methoxy or ethoxy), methylsulfonyl or ethyl-sulfonyl, benzothiazolyl optionally substituted by aminosulfonyl, methylaminosulfonyl, phenoxysulfonyl, and pyridyloxysulfonyl, cyanethylsulfonyl, chlorine, bromine, cyano, methyl, ethyl, methoxy, ethoxy, methylsulfonyl, ethylsulfonyl, and cyanethylsulfonyl, pyrazolyl optionally substituted by cyano, methyl and phenyl, thiadiazolyl optionally substituted by nitro, chlorine, methyl and phenyl, imidazolyl optionally substituted by nitro and methyl, thiophene optionally substituted by nitro and acetyl, imidazole optionally substituted by chlorine, and pyrazole optionally substituted by methyl and phenyl.

The following are given as examples 2- aminothiazole, Z-amino-S-nitrothiazole, Z-amino-S- methylsulphonylthiazole, 2-amino-5-cyanothiazole, 2- amino4-phenylthiazole, 2-amino-4-methyl-5- nitrothiazole, 2-amino-4-phenylthiazole, 2-amino-4- (4'chloro)-phenylthiazole, 2-amino-4-(4'-nitro)- phenylthiazole, 3-aminopyridine, 3-aminoquinoline, 3-aminopyrazole S-aminol -phenylpyrazole, 3 aminoindazole, 3-amino-l,2,4-thiazole, 3amino-5- (methyl-, ethyl-, phenylor benzoyl)-l,2,4-triazole, 3- amino- 1 -(4'-methoxyphenyl )-pyrazole, 2- aminobenzthiazole, Z-amino-tS-methylbenzthiazole, 2- amino-6-methoxybenzthiazole, 2-amino-6- chlorobenzthiazole, 2-amino-6-cyanobenzthiazole, 2- amino--thio-cyanobenzthiazole, 2-amino-6- nitrobenzthiazole, 2-amino-6-carboethoxybenzthiazole, 2-amino-4(4- or 6-)methylsul- 2-amino-l ,3,4-thiadiazole, 2- amino-l,3,5-thiadiazole, 2-amino-4-phenylor -4- methyl-1,3,5-thiadiazole, 2-amino-5-phenylor -5- methyl-1,3,4-thiadiazole, 2-amino-3-nitro-5-methylsulphonylthiophene, 2-amino-3,S-bis-(methylsulphonyl)- thiophene, 5-amino-3-methyl-isothiazole, 3- or 4- aminophthalimide The groups A and A are preferably residues of the formulae in which 0 0 d, and d each represents a hydrogen atom or a methyl, ethyl, methoxy, ethoxy, phenylthio or phenoxy residue.

The groups c and 0 are preferably bound in orthoposition to the azo group and, in addition to the abovementioned groups, may also represent a chlorine or a bromine atom, a trifluoromethyl group, an alkylsulphonyl group, preferably a methylsulphonyl group and an acylamino group that may be alkylated, preferably methylated, at the nitrogen atom and in which the acyl residue is the residue of an organic monocarboxylic acid, an organic monosulphonic acid, for example, methane-, ethaneor para-toluene-monosulphonic acid, or the residue of a carbamic acid or a carbonic acid monoester or monoamide, for example, phenoxycarbonyl, methoxycarbonyl and aminocarbonyl.

The pairs of substituents R and R R and R: and R' and R preferably have the same meaning. They may be hydrogen atoms or low alkyl groups, that is to say, alkyl groups containing one to four, preferably two to four, carbon atoms, for example, methyl, ethyl, npropyl or n-butyl groups, that may be substituted in the usual manner, for example, halogenated alkyl groups for example B-chloroethyl, ,Bflfl-trifluoroethyl or B;y-dichloropropyl 'y-chloro-B-hydroxypropyl; or by the following groups: fi-cyanoethyl; alkoxyalkyl containing up to eight carbon atoms for example fi-ethoxyethyl, 8-methoxybutyl or qS-butoxybutyl; hydroxyalkyl for example B-hydroxyethyl, B,'y-dihydroxypropyl; phenylalkyl containing up to eight carbon atoms, for example benzyl or phenethyl, alkoxy carbonylalkyl containing up to eight carbon atoms, for example butoxycarbonylethyl, propoxycarbonylethyl, methoxycarbonylpropyl, fatty acid acylaminoalkyl containing up to 10 carbon atoms, for example B-(acetyl or formyl)-aminoethyl, butyrylaminopropyl; fatty acid acyloxyalkyl containing up to 10 carbon atoms, for example B-acetylhydroxyethyl, fi,'y-diacetoxypropyl; butyryloxypropyl, hexanoyloxypropl; B-aryloxy-sulphonylalkyl for example B-benzenesulphonyloxyethyl or B-(pchlorobenzenesulphonyl)-ethyl; alkylor arylcarbamoylhydroxyalkyl containing up to seven carbon atoms for example 2-methyl-carbamyloxyethyl, B-butylcarbamyloxypropyl and B-phenylcarbamyloxyethyl; alkyloxycarbonyloxyalkyl contianing up to seven carbon atoms, for example B-(methoxy, ethoxy or isopropoxy)-carbonyloxyethyl, y-acetamidopropyl, B-(p-nitrophenoxy)-ethyl, B-(p-hydroxyphenoxy)- ethyl, cyanoalkoxyalkyl, e.g., cyanethoxyethyl; B-carboxyethyl, fi-acetylethyl, fi-diethylaminoethyl, fl-cyanoacetoxyethyland fl-benzoylor B-benzoylor B-(p-alkoxy or phenoxybenzoyl)oxyethyl.

The alkyl residues R and R, are, for example, 1,2- alkylene or 1,3-propylene groups or bridging groups of the formula which may be acylated. The acyl residue Ac is the residue of an organic monocarboxylic acid, a monosulphonic acid, a carbamic acid or a carbonic acid monoester or monoamide, for example, an acetyl, formyl, propionyl, benzoyl, stearoyl, methanesulphonyl, ethanesulphonyl, para-toluenesulphonyl, phenoxycarbonyl, methoxycarbonyl, phenylaminocarbonyl, methyl-aminocarbonyl or aminocarbonyl residue.

When the groups R, or R are bound to the group A or A in ortho-position to form a ring, tetrahydroquinoline or benzomorpholine residues, for example, are present, and the groups of the formulae A --NR,-R and/or A -NR R are then derived, for example from N-B-hydroxyethyll ,2,3 ,4-tetrahydroquinoline, N-B,y-dihydroxypropyl- 1,2,3,4-tetra-hydroquinoline, N-B,'y-dihydroxypropyl- 7-methoxyl,2,3,4-tetrahydroquinoline, N-B,'ydihydroxypropyl-S-acetylamino-l ,2,3 ,4- tetrahydroquinoline, N-B-hydroxyethyl-2,2,4- trimethyl-l ,2,3,4tetrahydroquinoline, N-B- hydroxyethylbenzomorpholine and N-B,'ydihydroxypropyl-S-acetylaminobenzomorpholine.

The groups R and R are alkyl, aralkyl or cycloalkyl groups, for example methyl, ethyl, propyl, benzyl or cyclohexyl groups or, together with the nitrogen atom that binds them, they form a pyrrolidine, piperidine, afi-y-methylpiperidine, morpholine, thiomorpholine or tetrahydroisoquinoline ring.

The residue Y is the anion of a strong organic or inorganic acid, for example, -Cl, -Br, -I, -SO -alkyl, -SO -aryl or -SO -O-alkyl.

The bifunctional briding group 2 is principally a group corresponding to one of the following formulae CH: is;

CH C H5 C 2115 R O-COCH;CH I I+-CH CH OCO, 2% 1'1. 8

i 5 -o o-cmcH,-N+-oH,c H,0-c-. 5 g

R; R5 135 -1\ I+cH;ciI,-c0ocii,cH,-ILI+cH1CH,0-GCHiCHiI 1 6 I ll l 1O Rs l- 3 7 s I I+CH CHCH N+CH;CHCH 1 I+ R on 6 OH in R5 5 ocH,oH2cH,-NH00-R,-00NH-oH,oH,oH,-1 I+,

5 B vd in which R, is the residue of a dicarboxylic acid freed from the carboxyl groups;

R5 R5 -I\ l+-CH;|CH1CH NHCONH-R NH-CONHCH1CH CHQI I+,

in which R is the residue of a diisocyanate freed from the isocyanate groups, and

R5 5 -i I+-C H10 11,01i,-N1i s(), msm-N|i-o1i,cii,cu,-z 1+-,

in which R is the residue of a disulphonic acid freed from the sulphonic acid groups.

Specially preferred are diazo compounds which contain a monoazo residue of the fonnula D1-N=N-A,-NR1 R, N+R,Rt

in which R, and R together may constitute an ethylene bridge when the residue R represents an ethylene bridge, and especially the disazo dyestuffs of the formulae R1 R5 R2 D,-N=N-A,-1 I-Ra1 I Ri1 IA,N=N-D,, R, \Y-

CH;CH, Re D -N=NA N +I I-R NA,N-ND;

CHPC ir- R, and

R1 v- [:DiN=N-A,-1 I oH -cH 3H,N -Rim (B-Acyl l2 in the Symbols D1, D2, A1, A2, R1, R2, R3, R4, R5, R and Y have the meanings ascribed to them in the above formula.

The new dyestuffs may be obtained by a) coupling two coupling components of the formula which are linked to each other through a bifunctional bridging group Z which has no dyestuff characteristics and which contains at least one quaternated nitrogen atom, in which formula A represents the residue of an arylene component and R and R each represents an alkyl group, with diazo compounds derived from amines of the formula D,NH and D -Nl-l to form disazo compounds, the symbols D and D each representing monocyclic or bicyclic residues, or b) reacting two identical or different dyestuffs of the formula in which D and R have the meanings given above, A represents an arylene residue and R represents an alkyl group, and in which a reactive substituent is present in one of the residues A and R', either simultaneously or successively in two steps with compounds which yield the bifunctional bridging group Z which has no dyestuff characteristics, or c) treating with quaternating agents a disazo compound in which two monoazo dyestuff molecules of the formula are linked through a bridging group Z which contains at least one nitrogen atom capable of being quaternated and has no dyestuff characteristics. 1 Process (a) A. Coupling components:

The coupling components for use in process a) of the invention are preferably those of the formula in which x,, x x and x each represents zero or 1 and in which the group Ac represents the residue of an orx, x x x 2; R R,, R',, R',, R; and R, each ganic monocarboxylic acid:

represents a hydrogen atom or preferably an alkyl group, and in which when x, 1 and/or x, 1, R may be bound to the residue A to form a ring and/or R 5 may be bound to the residue A to form a ring; R and R1 it2 R each represents an alkylene group; A and A, each Cm represents a phenylene residue in which the azo gorup and the secondary or tertiary amino group are in 1,4- position to each other and Z is bifunctional bridging group which has no dyestuff characteristics and which contains at least one quaternated nitrogen atom. They may be coupled with diazo compounds derived from (manufactured, for example, by acylation of an N-(yamines of the formulae D -Nll and D -NH,, in which aminopropyl)-H-alkylaniline with a 'y-N,Ndime- D, and D have the meanings given below. thylaminopropionic acid halide and alkylation of the The coupling components which may be used in the tertiary amino groups with an N-B-chloroethyl-N- synthesis of the dyestuffs of the invention are, for exlk l ili ample, the compounds corresponding to the following R formulae: n-A,N in

ClhClh0-CCll;-N' C7115 Call. it

a R, \CZH;II\}I cz u. NAaH t CH3 \C] -CH fiO-CH1CH2 C HiClN O CHrCHI (manufactured, for example,,by esterification of 2 mols \l l of N-B-hydroxyalkyl-N-alkylaniline with 1 mol of cm, N* CH;

| lminodlacetic acid dichloride and subsequent quaternation of the imino group): CQH} e A HA|-N 1'2, NA,H CH1CHTN+CH;CHZOCOGHZCHZ N on: N a H dri,cir, r cn, H2 40 cu, gfmsor (manufactured, for example, by reacting an N-B- W300i. chloroethyl-N-alkylaniline with monoethanolamine, quatemation of the aliphatic nitrogen atom and subse- 02H] C1 N quent reaction with a chloroformic acid ester of an N Q\ CH3 B-hydroxyethyl-N-alkylaniline):

/R1 R2 H- -N Ila, N-A -H omen,-p-o-cmcm-pn-cmcn -om cn N cm N- 3 1 (manufactured, for example, by reacting 2 mols of an H I acid chloride or chloroformic acid ester of an N-ficarboxyethyl-N-alkylaniline with a diethanolalkylamine and subsequent quaternation): and

CH1CH1CN NCCH1CHQ N on, N

cm-cn-cm-w cm-on-oH, CH CH CH CHz 0A0 0A0 HA1N/ NCH1N NA,H

the doubly quarternated coupling components of the formulae in which R.,, R and R have the meaning given above. These doubly quaternated coupling components may be obtained by reacting 2 mols of the hydrogenated adduct of acrylonitrile and an N-y-methylaminopropyl-N- alkylaniline of the formula with 1 mol of a dicarboxylic acid or disulphonic acid I I halide or with 1 mol of a diisocyanate and then quater- R C t l Q nating.

Nit-co c o n z Also suitable are the compounds of the formula i In \Y- d d; cHicH; on,og, 1

0-0 0- c 0-6 in which c (I and d, have the meanings given above and X* represents an aliphatic, cycloaliphatic or arali- Y- phatic residue, for example, the coupling components indicated in the following Table:

1 R'3R1N Y Z l MC 0: 41 d: 0cincHr-N;H2cn,;N ;n,cur-0 1 H it H ii CHZCH Z 5 6 5 6 2 H H H H CH,CH,CH, 3 H H H H CH,CH(OH)CH, 4 H H H H -CH,CH,OCH,CH, 5 H H H H -CHCH,N(CH,)CH,CH, and 6 H H H H CH,CH,NHCH,CH, 7 H H H H CH,CH,SO,CH,CH, 8 H H H H -CH,CH,SO-CH,CH,- 9 H H H H -CH,CH,SCH,CH, Q

R|R/3N NRQR I and the trebly quaternated coupling components of the O CHCH;N+\ CHCH1 O formulae 5 Re (manufactured, for example, by reacting 2 mols of the adduct of acrylic acid ethylester and an N-y-amino-N- Rn 0H Rt OH B. Diazo components D N=NA,-NR,Z,

The diazo components which may be used are, for example, the amines corresponding with the definition of the diazo residues D and D C. Diazotization and coupling:

Diazotization of the above-mentioned diazo components may be effected by known methods, for example,

in which D, A and R have the meanings given above and the residue 2, corresponds, for example, to the formula R NR R in which R R and R have the meanings given above, is reacted with a monoazo dyestuff of the formula with a mineral acid and sodium nitrite or, for example, zz 2- with a solution of nitrosylsulphuric acid in concenin which, f example X represents and and rated Sulphuric acid- 10 Y have the meanings given above, together with qua- Coupling may also be carried out in known manner, tamation to f the disazo d t ffi for example, in a neutral to acid medium, if necessary, F example, a d t ff f h f l in the presence of sodium acetate or a similar butfer 7 which influences the rate of coupling, or a catalyst, for

example, dimethyl-formamide, pyridine or the salts th- 1 O ereof. cmom-o s 0, -or13 Coupling may also be effected advantageously by combining components in a mixing nozzle. By mixing nozzle is meant a device in which the liquids to be may be reacted with a dyestuff of the formula mixed are combined with one another in a comparatively small space, whereby at least one of the liquids 2 is conducted through a nozzle, preferably under pres- 'C sure. The mixing nozzle may be constructed and oper- CECIL-M61191 ated, for example, on the principle of the water jet pump. the supply of one of the liquids to the mixing to form a dyestufi' of the formula R s 030-011, R:

cmcm-N omen,

CH: CH:

nozzle corresponding to the supply of water in the The two halves of the dyestuff may be identical or water jet pump, and the supply of the other liquid cordifferent. This reaction is carried out under the same responding to the connexion between the water jet Condition-S 88 the quatemation described belowpump and the vessel to be evacuated; feed of the liquid Ill. Process c) through the latter supply route may also be effected The new dyestuffs may also be obtained by treating under pressure. with a quatemating agent one of the dyestuffs de- Other devices to effect rapid and, if necessary, con- 40 scribed above, in which the symbol Z represents a bitinuous mixture in a small space may also be used. functional bridging group containing at least one qua- After coupling, the non-quatemated dyestuffs that ternatable nitrogen atom. It is specially advantageous are formed can easily be separated from the coupling to quaternate the dyestufis of the formulae mixture, for example, by filtration, because they are virtually insoluble in water. When the dyestuffs obwwflwawlkiivvmfiW Q tained are quaternated, they may be salted out. DIN=NAIN N-AN=N-D1 When a bifunctional coupling component is coupled with less than two mols of a diazonium compound, a mixture of the disazo dyestufis of the invention and monoazo dyestuffs is formed, and this process is also R, included in the present invention. II. Process b) The new dyestuffs may also be obtained by process b) of the invention in which two monoazo dyestuffs are linked together. One of the two monoazo dyestuffs may in which the symbols R R R A,, A,, D,, D, and Ac already contain a quaternated amino-group, or, preferhave the meanings given above. ably, it may be formed during the linking process. To The dyestuffs of the following formulae may be menthis end, a monoazo dyestuff of the formula tioned as starting materials for the quatemation:

cu, c n-cu,-N-cn,-on-cu, and 0000218 ocoom Given that D, D the following three sets of conditions may obtain, depending on the quaternatability of the diazo residues D, and D and the quaternatable nitrogen atoms present in the quaternatable residue:

1. The diazo residues D, and D, are not quaternatable. This applies, for example, in the case of negatively substituted anilines, when dyestuffs are obtained which can be quaternated only in the bridging group Z.

2. The diazo residues D, and D are more difficult to quaternate than the residue Z. In this case, the quaternation may be carried out in a manner such that the reaction is discontinued after quaternation of the residue Z. Alternatively, the quaternating conditions can be intensified, for example, by the addition of an excess of the quaternating agent or by raising the temperature, in a manner such that at least one of the residues D, and D is quaternated in addition to the residue Z.

3. The diazo residues D, and D are more easily quaternatable. In this case, when process c) is adopted, only those dyestuffs in which D,, D, and Z are quatemated are obtained.

In this process the disazo dyestuffs are quaternated with esters of strong mineral acids or organic sulphonic acids, for example, dimethyl sulphate, diethyl sulphate, alkyl halides, for example, methyl chloride, methyl bromide or methyl iodide, aralkyl halides, for example, benzyl chloride, esters of low-molecular-weight alkanesulphonic acids, for example, the methyl ester of methane-, ethaneor butane-sulphonic acid, and the alkyl esters of (4-methyl-, 4-chloroor 3- or 4-nitro)- benzene sulphonic acid which, as anions, form halogen, sulphuric acid semi-ester, alkane or benzene sulphonic acid anions.

Quaternation is preferably effected by heating in an inert organic solvent, for example, xylene, carbon tetrachloride, ortho-dichlorobenzene or nitrobenzene. Alternatively, it is possible to use solvents for example acetic anhydride, dimethylforrnamide, acetonitrile or dimethyl sulphoxide. The quatematable dyestuffs preferably contain as anion Y the residue of a strong acid, for example sulphuric acid or a semiester thereof, or a halogen ion, but they may also be used as double salts, for example, with zinc chloride, or as free bases.

IV. Use

In so far as they are in the form of salts of strong inorganic acids which form more or less neutral aqueous solutions, the azo dyestuffs used in accordance with the invention may be applied in a slightly alkaline, neutral or slightly acid bath. It is advantageous to carry out dyeing in an acidic bath to which the acid required, for example, acetic acid, formic acid, tartaric acid, a naphthalene sulphonic acid, an alkali bisulphate, sulphuric acid, an acidic alkali metal phosphate or phosphoric acid is added at the commencement of the dyeing process, or to which a substance is added which liberates acid during the dyeing process. Substances which produce acid are, for example, salts of volatile bases and strong, non-volatile acids, for example, ammonium sulphate, or water-soluble esters of organic acids, which are saponified during the dyeing process, for example, the methyl or ethyl esters of aliphatic hydroxyacids, for example, lactic, malic or tartaric acid. When mineral acid solutions of the dyestuffs to be used in accordance with the invention are employed, the mineral acid may also be buffered during the dyeing process by the gradual addition of alkali metal salts of weaker acids, for example, sodium acetate. Dyeing may be carried out in an open vessel at the boil or in a closed vessel under superatmospheric pressure at a temperature above 100C. The azo dyestuffs in accordance with the invention may be used for dyeing and printing a very wide variety of synthetic fibres, for example, polyvinyl chloride, polyamide and polyurethane fibres, and also fibres made from polyesters of aromatic dicarboxylic acids, for example, polyethylene terephthalate fibres; but they are specially useful for dyeing and printing polyacrylonitrile fibres or polyvinylidene cyanide fibres (Darvan). By polyacrylonitrile fibres is meant primarily polymers containing more than percent, for example, 80 to of acrylonitrile; they may also contain 5 to 20% of vinyl acetate, vinyl pyridine, vinyl chloride, vinylidene chloride, acrylic acid, acrylic acid esters, methacrylic acid, methacrylic acid esters and the like. These products are sold, for example, under the following trade-names: Acrilan 1656" (The Chemstrand Corporation, Decatur, Alabama, U.S.A.), Acrilan 41 (The Chemstrand Corporation), Creslan (American Cyanamid Company), Orion 44" (Du Pont), Crylor I-IH" (Soc. Rhodiaceta Sa, France), Leacryl N" (Applicazioni Chimice Societa per Azioni, Italy), Dynel (Union Carbide Chemical Corporation), Exlan" (Japanese Exlan Industry Co., Japan), Vonnel" (Mitsubishi, Japan), Verel (Tennessee Eastman, U.S.A.), Zefran (Dow Chemical, U.S.A.), Wolcrylon (Filrnrabrik Agfa, Wolfen), Ssaniw (U.S.S.R.) and also Orlon 42, Dralon, Courtelle and so forth.

The new dyestuffs produce on these fibres, which may also be dyed in admixture with one another, intense and level dyeings possessing good fastness to light and good general properties of fastness, especially good fastness to washing, perspiration, sublimation, creaseresist finishing, decatizing, hot-pressing, rubbing, carbonizing, water, sea water, dry cleaning, cross-dyeing and solvents.

The present invention therefore also includes a process for dyeing man-made fibres, for example, fibres made from polyurethanes, cellulose triacetate, cellulose acetate (so-called Zia-acetate), fibres made from linear aromatic polyesters, for example, those made from terephthalic acid and ethylene glycol or 1,4 dimethylol-cyclohexane and copolymers derived from terephthalic and isophthalic acid and ethylene glycol, fibres based on polyepoxides, polyamides, for example, nylon 6, nylon 6.6 or nylon 12 or polyolefine fibres, for example, modified polypropylene, but especially acrylic fibres made from polyacrylonitrile and copolymers of acrylonitrile and other vinyl compounds, for example, acrylic acid, acrylic esters, acrylamides, methacrylic acid, methacrylic esters, methacrylic amides, vinyl pyridine, vinyl chloride or vinylidene chloride, copolymers of dicyanoethylene and vinyl acetate, and also acrylonitrile block polymers, wherein disazo compounds are used in which two monoazo dyestuff molecules of the general formula in which D represents the residue of a monocyclic or bicyclic diazo component, A represents an arylene residue and R and R" each represents an alkyl residue, are linked together via their coupling components of ethylacetate. The coupling component of the formula so obtained melts at 123C.

Further coupling components of this kind may be obtained in an analogous manner by reacting the toluenesulphonic acid esters listed in Column 11 of the following Table with the tertiary amines shown in Column 111.

I II III IV Number Toluenesulphonic acid ester of Tertiary amine C CzH OH CzH4-N /C H:

Hz- G H2 2 Same as above CzHs 137-8 N C Hz- 0 H:

C zH4-N 0 C Hz' C H:

3 O C H; 128

l C i C 2 N N C H:

H CZHtOH C2H4N\ dyestuffs is generally carried out in an aqueous neutral or acid medium at the boil under atmospheric pressure or in a closed vessel under superatmospheric pressure at higher temperatures. The commercially available levelling agents have no adverse effect, but they are not necessary. The dyestuffs mentioned are also very suitable for three-colour dyeing. By virtue of their stability towards hydrolysis, they may be used advantageously for hightemperature dyeing and for dyeing in the presence of wool. They may also be applied to the fibrous materials by printing processes. In this method of application there is used, for example, a printing paste which contains the dyestuff and the adjuvants commonly used in printing, for example, wetting agents and thickeners.

The dyestuffs of the invention are also suitable for colouring polymerization products of acrylonitrile and other plastics by addition to the composition or a solution thereof, prior to the shaping operation, the shades obtained being fast to light and washing.

The following Examples illustrate the invention. Un-

less otherwise stated, the parts and percentages are by weight.

Preparation of the coupling components Procedure 1 31.9 Parts of N-ethyl-N,2-hydroxyethylanilineparatoluene-sulphonic acid ethyl ester and 19.2 parts of N-ethyl-N,2-(N',N'-dimethylamino)-ethylaniline are stirred for 3 hours at 90 to 100C and the honeycoloured liquid which forms is treated with 200 parts of ethyl acetate. The condensation product precipitates in the form of white needles. After cooling, the product is isolated by filtration and washed with a small amount Procedure 11 3,7,3,'y'-Diepoxytripropylamine (prepared in accordance with French Pat. Specification No. 1,137,175) are heated with ethylaniline in chlorobenzene to yield B,B'-dihydr0xy-'y,'y'-di(N-phenyl-N-ethyl)- aminotripropylamine. The product is then acetylated with an excess of acetic anhydride and the reaction mixture evaporated in vacuo to yield fl,/3'-diacetoxy- 'y,'y'-di(N-phenyl-N-ethyl)-aminotripropylamine of the formula I a s Procedure IV 23.3 Parts of N,2-(N'-phenyl-N'-ethyl)-aminoethylpiperidine, 10.1 parts of 1,3-dibromopropane and parts of dimethylformamide are stirred for 3 hours at 140 to 145C until no turbidity forms on dilution with water. The solvent is evaporated in vacuo and the residue is dissolved in 100 parts of water. The solution of the compound of the formula inc, Lu Lu C lla is obtained. A thin-layer chromatogram shows that the solution is free from lay-products.

An analogous compound in which the two positively charged nitrogen atoms are linked by a bridge consisting of four methylene groups is obtained when the 1,3- dibromopropane is replaced by 1,4-dibromobutane.

The following bifunctional coupling components may also be obtained in an analogous manner:

Procedure V 256 Parts of the toluenesulphonic acid ester of N- alkyl-N,2-hydroxyethylaniline, 290 parts of ethanol and parts of 35% aqueous methylamine solution are vigorously heated for 1 hour under reflux. The solvent is evaporated, the residue is taken up in 800 parts of water, parts by volume of 30% sodium hydroxide solution are added, the mixture extracted with chloro- 65 form, the chloroform extract is dried with calcined sodium sulphate, the solvent is evaporated and the residue is distilled. The compound of the formula is obtained at 156 to 158C under a pressure of 0.04 mm Hg.

Procedure VI 64 Parts of the toluensulphonic acid ester of N-ethyl- N,2-hydroxyethylaniline, 17.2 parts of N,N,N,N'- tetramethylhexamethylenediamine and parts of dimethylformamide are heated to 70C, whereupon the exothermic reaction raises the temperature of the reaction mixture to 120C. After the reaction subsides, the batch is heated again to the boil and then allowed to cool. The crystal slurry so formed is diluted with 400 parts of ethyl acetate, suction filtered, and the filter residue is washed with ethyl acetate. 79 Parts of the compound of the formula dimethylamino-ethylether, 108 parts of 1,4- dibromobutane and 200 parts of dimethylformamide are stirred for 12 hours at 120 to C, the mixture is allowed to cool, 400 parts of water are added, and the batch is then stirred until the coupling component crystallizes. The product is isolated by suction filtration, washed with 400 parts of a 10% sodium bromide solution, dried, and the compound of the formula is obtained.

EXAMPLE 1 10.2 Parts of the coupling component prepared in accordance with Procedure 1 by quaternation of N-ethyl- N,B-(N',N-dimethylamino)ethylaniline are dissolved in 500 parts of water and 10 parts of glacial acetic acid. A diazo solution prepared from 69 parts of a 10% aqueous paste of 2-chlor0-4-nitroaniline by diazotization with sodium nitrite and hydrochloric acid is run into the solution so obtained, the coupling mixture is rendered neutral to Congo red by the addition of sodium Dyestuffs which yield the shades listed'in Column ill of the following Table may be obtained by replacing the 2-chloro-4-nitroaniline with the diazo components listed in Column ll.

I [I I l 2-amirionitrobenzonitrile 1F hm 2 2.6'dichloro-4-nitroaniline yellowish brown 3 4-nitrouniline orange 4 4-amino-3-chlorophenylmethylsulphone orange 5 5-amino-3-phenyl-l .ZA-thiadiazole red 6 2-aminoS-nitrothiazole bluish violet EXAMPLE 2 5.36 Parts of the monoazo dyestuff of the formula c Ila-SO:-QN=NC G ll N (3 II 0 so @011 2 2 I (obtained by coupling diazotized 4-amino-3- chlorophenylmethyl-sulphone with N-ethyl-N,2-

hydroxyethylaniline-para-toluene-sulphonic acid ester) and 3.5 parts of the monoazo dyestuff of the formula uh-N CII;

for 6 hours. After cooling, a small amount of unreacted starting material is removed with ethyl acetate and the residue is recrystallized from 2% acetic acid. A dark dyestuff powder is obtained that dyes polyacrylonitrile fibres an olive-green shade. Dyeing procedure:

1 Part of the dyestuff so obtained of the formula is dissolved in 5,000 parts of water in the presence of 2 parts of 40% acetic acid. 100 Parts of dried polyacrylonitrile staple fibre yarn are entered into this dyebath at 60C, the temperature is raised to l00C within half an hour and dyeing is carried out for 1 hour at the boil. The yarn is then well rinsed and dried. An olive-green dyeing possessing very good fastness to light, sublimation and washing is obtained.

EXAMPLE 3 3.3 Parts of 2-cyano-4-nitroaniline are diazotized at 20C in 20 parts by volume of N nitrosylsulphuric acid and then discharged on to 200 parts of ice. A solution of 4.97 parts of B,B-diacetoxy-y;y'-di-(N'phenyl-N- ethyl)-aminotripropylamine in 50 parts by volume of dimethylformamide is added dropwise to this solution at a temperature not exceeding 10C, the batch is stirred for 3 hours, neutralized with 30% NaOH and stirred overnight. The dyestuff is isolated by filtration and dried in vacuo. The dyestuff so obtained corresponds to the formula The dried dyestufi of the above formula is then suspended in 50 parts of chlorobenzene, the suspension is heated to C and a small excess of dimethyl sulphate is slowly added. The batch is kept at that temperature for 3 hours, allowed to cool, filtered, and the residue is Dyestuffs which dye acrylic fibres the shades listed in taken up in water. Finally, the dyestuff of the formula Column III of the following Table may be obtained by proceeding in the above manner and coupling the couis salted out, isolated by filtration and dried. it dyes pling components listed in Column II with the diazo polyacrylonitrile a violet shade. 15 components given in Column l.

TABLE-Confirmed lll Numbur I ll C111 Roll.

U2N Nll2 +2 I l C] C1H -l\|l(CHz)3 2 C H5 REG.

OzN- NH; +2

N CH: 1 1 Cl C21'I4 N (CH1)7 3 Same as above Ruby.

OzN NH1 CzH5 Red.

Blue. mu- LNH; "J

\ITI 1111 C H: i

6.. Cl CzHs +2 Yellowish l brown.

N C H; O zN N 2 C2HJIII (C D3- Cl C H; 2

7. Same as above. Ruby.

0 zN- NHg 8 Same as above D0.

C 2H: HsC 2 N N-- C 2 r-N- C 2H:

9 .do 0 D0.

C H H: C N N- C zHr-N C 2H;

M TABLE-Continued Number I II III 10. Cl CH; Brown.

| 02m me I 03N NH: N CH: N

l C2H4N+C2H| 01 CH;

11 0 cm Red.

O N NH: 02115 HsC N CH: N Cl l C2H4N+C 1H4 l CH: 7 CH:

N cm m0 Reddish hlue. N 0m N N Nll I s (hurry-0m.

(Ill:

13 Sumo as above m Blue. pm N C2H4'II\I+ 4321b -i-CH:

14 CHzCH CN NCCI zHzC Scarlet.

II II N CH; N N C-NH2 l \S CzHi II CgHq 15.. I CH CHzCN M's-curiae Yellow.

CH;03S NH;

WQ Cl C2114 111 02H Inc +2 EXAMPLE 4 40 N c,u.. 1

7 Parts of dry sodium nitrite are introduced at to ON NZN C into 80 parts of sulphuric acid monohydrate. The a batch is heated to 60C, allowed to cool, and then 16.3 N o crr,cmN-cmcm parts of 2-amino-5-nitrobenzonitrile are added in portions at 20 to 25C. The batch is stirred for one hour and then poured on to 300 parts of ice. The clear diazo solution is then run quickly into a solution of 34.4 parts of the coupling component of the formula It is readily soluble in hot water and dyes acrylic fibres a violet shade possessing good properties of fastness.

EXAMPLE 5 1 MOI of N-bis-B-hydroxyethyl-3-nitroaniline, together with 2.2 mols of acetic anhydride, are heated for 3 hours at 130C, the acetic acid is then removed in vacuo and the residue is distilled in a high vacuum. N- bis-B-acetoxyethyl-3-nitroaniline is obtained.

2 Mols of N-bis-fl-acetoxyethyl-3-nitroaniline are hydrogenated in 2 litres of absolute ethanol in the presence of Pd/charcoal; the solvent is then removed in vacuo and the residue is distilled in a high vacuum. N- bis-B-acetoxyethyl-B-aminoaniline is obtained. Preparation of the bifunctional coupling component:

5.] Parts of pyridine-2,6-dicarboxylic acid chloride in 50 parts by volume of chlorobenzene are added slowly at room temperature to 14 parts of N-bis-B- acetoxyethyl-2-aminoaniline dissolved in 50 parts by volume of anhydrous chlorobenzene. The batch is heated to to C and stirred overnight at that tem- 27 28 perature. After cooling, the chlorobenzene is decanted which couples bifunctionally is obtained in the form of and the residue is triturated with ether. The product is an oil.

then isolated by filtration and dried.

8.22 Parts of 3-ch1oro-4-aminophenylrnethylsulphone are diazotized in N nitrosylsulphuric acid. The solution so obtained is added dropwise at a temperature not exceeding C to a solution of 13.82 parts of the bifunctional coupling component dissolved in 200 parts by volume of dimethylformamide. The batch is stirred overnight at 0 to 10C and the dyestuff is pre- 10 cipitated by the addition of ice and water. The dyestuff is isolated by filtration and dried in vacuo, and then 3 parts of the dyestuff so obtained are heated in. 75 parts by volume of nitrobenzene at 75C and stirred until the 3 Parts of the dyestufi so obtained are heated to 75C dyestuff is completely dissolved. 3 Parts by volume of in 75 parts by volume of nitrobenzene and the batch is dimethyl sulphate are then dded, the batch is heated to stirred until the dyestuff has completely dissolved. 6

3.88 Parts of 2-amino-6-ethoxybenzthiazole are diazotized at 0 to 5C in parts by volume of N nitrosylsulphuric acid in the presence of glacial acetic acid/- propionic acid, and the solution is then added dropwise at a temperature not exceeding 10C to a solution of 4.97 parts of the bifunctional coupling component in 200 ml of acetone. The batch is then stirred overnight at 0 to 5C, neutralized with sodium hydroxide solution and the dyestuff is precipitated by the addition of water. It is isolated by filtration and dried in vacuo.

C and then stirred for 5 hours at that temperature. Parts by volume of dimethyl sulphate are added, the The nitrobenzene is removed by steam and the dyestuff batch is heated to 90C and stirred for 5 hours at that is salted out of the aqueous solution that remains with temperature. The nitrobenzene is then removed with sodium chloride. The dyestuff is isolated by filtration 20 steam, the aqueous solution which remains is filtered, and dried. 1t corresponds to the formula and the dyestuff in the filtrate is salted out with sodium 0 4:11;!" Cl- NH J2 and dyes modified acrylic fibres, nylon-6,6 fibres, wool chloride. After filtration and drying, a dyestufi' of the fabrics and silk a red shade. formula 2 5 \CN=NC N/ LIL-(n) 011150 cn,cncm -1 O-( 3Cl-1; H:

EXAMPLE 6 is obtained which dyes polyacrylonitrile a blue shade 30 Parts of N-ethylaniline, l7.l parts of possessing good properties of fastness. 8,7,3,y'diepoxytripropylamine, 30 parts by volume of chlorobenzene and 10 drops of triethylamine are stirred for 30 hours at to C. The solvent is then removed in vacuo and the residue is distilled in a high vacuum. B,B'-Dihydroxy-'y;y'-di-(N-phenyl-N- 50 eth-ylamino?l tripropylamine is obtained in the form of The following dyestuffs were prepared as described a VISCOUS O1 I r Exam le 1 (Table No. 1-10 and 12-15) oras in Ex- 30 Parts of 3,3 -dihydroxy-y;y -d1-(N-phenyl-N- m p j; 3:222:21?5::23.25.221.12;12 2;233:252: v0 ume o ace 1c an y n e are eate or ours 5 under reflux" The solvent is the removed in vacuo and coupling components listed "'1 column 11 of the table. the residue is distilled in a high vacuum. fi,fi'-Diacetox- The dyestuffs dyed polyacrylonitrile fibres in the y- '-di-(Nphenyl-N-ethyl-amino)-tripropylamine shades given in column 111.

EXAMPLE 7 TABLE-Con tinned NO. I II III No. H m

12 2-amin0-6-cyano- CH; CH; \iuh-L benzothiazolo.

CH S H; H3 H C H1 H N Hzc H: I? din-wag 13 cm-cn2 C iii-6-803 13 2 amin0-4,(i-dinitro- Same as above mun.

hcnzothiamlev l4 Z-amino-E-phenylw Red.

1,3,4-tl1iadiazo1c. l

a CzH QCOCiHn N- N C H;

U2H4N z) s NL H1 cm 131- B'ron3 15 i 2-amin0-4-pheny1- Same as above Red.

1 ,3,5-thiadiazole.

We claim: I. A disazo dyestuff which corresponds to the formula in which x., x x and x each represents zero or i and x, x x x, 2; R R R R' R and R, each represents alkyl containing up to 10 carbon atoms or alkyl containing up to 10 carbon atoms substituted by a member selected from the group consisting of chlorine, bromine, phenoxy, phenyl, C,-C -alkonoyl-oxy, C C -alkanoylamino, cyano, C -C -alkoxy, benzoyl, cyanethoxy, C -C alkylcarbamoyl, aminocarbonyl and C -C,-alkyloxycarbonyloxy, and when said R is bound to A 1 forms tetrahydro-quinoline and when said R, is bound to A forms tetrahydro-quinoline; R and R each is alkylene of up to three carbon atoms or auren-0H2- wherein Ac represents alkanoyl of up to three carbon atoms, benzoyl, stearoyl, phenoxycarbonyl, alkoxycarbonyl containing up to five carbon atoms, phenylaminocarbonyl or methylaminocarbonyl; A l and A each is wherein c, and d each represents hydrogen, C -alkyl, C -alkoxy, acetylamino, phenoxycarbonylamino, methoxycarbonylamino or aminocarbonylamino; the azo group and the dialkylamino group in said formula are attached in para-position to each other; D and D each represents a member selected from the group consisting of thiazolyl, benzthiazolyl, pyrazolyl, thienyl, thiadiazolyl, imidazolyl, benzimidazolyl, pyridyl, benzisothiazolyl, isothiazolyl, indazolyl, thiazolyl substituted by chlorine, bromine, cyano, nitro, phenyl, C C,- alkyl, C,-C,-alkoxy, methylsulfonyl or ethylsulfonyl, benzothiazolyl substituted I by aminosulfonyl, methylaminosulfonyl, phenoxysulfonyl, and pyridyloxysulfonyl, cyanethylsulfonyl, chlorine, bromine, cyano, Cn- C -alkyl, C -C -alkoxy, methylsulfonyl, ethylsulfonyl, and cyanethylsulfonyl, pyrazolyl substituted by cyano, methyl or phenyl, thiadiazolyl substituted by nitro, chlorine, methyl and phenyl, imidazolyl substituted by nitro or methyl, thienyl substituted by nitro or acetyl, imidazolyl substituted by chlorine, and pyrazolyl substituted by methyl and phenyl selected from the group consisting of wherein Z is pyridinium or azaalkylene having up to six carbon atoms in which the nitrogen atom carries a positive charge;

(2) a group selected from the formulae in which Y represents an anion and R and R each are C -alkyl or together form alkylene, azaalkylene, oxa-- alkylene or triaalkylene of up to five carbon atoms.

2. A disazo dyestuff which corresponds to the formula in which x,, x x and x each represents zero or 1 and x, +x x +x 2; R R R',, R',, R; and R. each represents alkyl of up to four carbon atoms, or alkyl containing up to four carbon atoms substituted by a member selected from the group consisting of chlorine, bromine, phenyl, phenoxy, C -C -alkanoyloxy, C C alkanoylamino, cyano, C -C -alkoxy, benzoyl, cyanethoxy, and when said R is bound to A forms tetrahydro-quinoline and when said R, is bound to A, forms tetrahydroquinoline; R and R each is alkylene of up to three carbon atoms or alkylene substituted with alkylcarbonyloxy containing up to three carbon atoms; A, and A, each is phenylene or phenylene substituted with methyl, methoxy, chlorine or acetylamino; the azo group and the dialkylamino group in said formula are attached in para-position to each other; D, and D, each represents the residue of a diazo component selected from the group consisting of thiazole, benzothiazole, pyrazole, thiophene, thiodiazole, imidazole, thiazole, benzoimidazole, pyridine, benzoisothiazole, isothiazole or indazole series and Z is selected from the group consisting of (l) -NHCOZNH wherein Z' is pyridinium or azaalkylene having up to six carbon atoms in which the nitrogen atom carries a positive charge;

(2) a group selected from the formulae in which Y represents an anion and R and R each are c -C -alkyl or together form -CH CH,CH,CH

4. A disazo dyestuff as claimed in claim 1, in which X =1 5. A disazo dyestuff as claimed in claim 2, in which Z is a residue of the formula wherein Z' is pyridinium or azaalkylene of up to six carbon atoms in which the nitrogen atom carries a positive charge.

6. A disazo dyestuff as claimed in claim 2, which corresponds to the formula 7. A disazo dyestuff as claimed in claim 2, wherein R and R, fonn tetrahydroquinoline and wherein R and R are beta-(hydroxy-or C -C -alkyl-carbonyl-oxy) propylene.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION PATENT NO. 3,755,287 DATED I August 28, 1973 |NVENTOR(S) Hegar et a1.

It is certified that error'appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Claim 1, column 32, line 47, between "phenyl" and "selected", insert and Z is Claim 2, column 33, lines 27-31, "the residue of a diazo componentuuor indazole series" should read a member selected from the group consisting of thiazolyl, benzthiazolyl, pyrazolyl, thienyl, thiadiazolyl, imidazolyl, benzimidazolyl, pyridyl, benzisothiazolyl, isothiazolyl, indazolyl, thiazolyl substituted by chlorine, bromine cyano, nitro, phenyl, C C -alkyl, C -C alkoxy, methylsulfonyl or ethylsulfonyl, benzothiazolyl substituted by aminosulfonyl, methylaminosulfonyl, phenoxysulfonyl, and pyridyloxysulfonyl, cyanethylsulfonyl, chlorine, bromine, cyano, C -C -alkyl, C C alkoxy, methylsulfonyl, ethylsulfonyl, and cyanethylsulfonyl, pyrazolyl substituted by cyano, methyl or phenyl, thiadiazolyl substituted by nitro, chlorine, methyl and phenyl, imidazolyl substituted by nitro or methyl, thienyl substituted by nitro or acetyl, imidazolyl substituted by chlorine and pyrazolyl substituted by methyl and phenyl Signed and sealed this 1st day of July 1975.

(SEAL) Attest:

C. I-iAR3HALL DANN RUTH C. I'iASON Commissioner of Patents Attesting Officer and Trademarks 

2. A disazo dyestuff which corresponds to the formula
 3. A disazo compound as claimed in claim 1, in which the bridging group Z contains at least one group of the formula
 4. A disazo dyestuff as claimed in claim 1, in which X3
 1. 5. A disazo dyestuff as claimed in claim 2, in which Z is a residue of the formula -NH-CO-Z''-CO-NH-wherein Z'' is pyridinium or azaalkylene of up to six carbon atoms in which the nitrogen atom carries a positive charge.
 6. A disazo dyestuff as claimed in claim 2, which corresponds to the formula
 7. A disazo dyestuff as claimed in claim 2, wherein R1 and R2 form tetrahydroquinoline and wherein R3 and R4 are beta-(hydroxy-or C1-C3-alkyl-carbonyl-oxy) propylene. 